Car-brake.



No. 840.215. PATENTBD JAN. 1, 190.7.

' D. J. BOUGHTM.

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UNITED sTATEs PATENT oEEIoE.

Specification of Letters Patent.

. Applicationled May 17, 1906. Serial No. 817.285.

Patented Jan. 1, 1907.

To all whom, t may concern:

Be it known that I, DAVID J. HoUGHToN, a citizen of the United States, residing at Detroit, county of Wayne, and State of Michigan, have invented a certain new and useful Improvement in Car-Brakes; andI do de clare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates tov an improvement in car-brakes, shown drawings, and more particularly set forth in the following specification and claims.

In the drawings, Figure l is a plan view of a truck-frame, showing my improvement in stalled thereon, with parts broken away to more clearly illustrate the invention. Fig. 2 is a vertical section through the brakebeams, showing details of the construction.

3 is a vertical section through the brakebeams and one of the retaining-plates.

The object of my invention is to construct an air-brake in which the power is applied in such manner that an even pressure will be exerted on all of the wheels, and when the air-brake mechanism is out of commission the hand-brake may be applied without causing the operator to overcome the resistance exerted by the pistons of the brake-cylinder on applying the hand-brake, as required in many types of brakes now in use.

Other advantages and improvements will appear by further reference to the specification.

Referring to the letters of reference shown in the drawings, A is the frame, B B the caraXle, and B B the car-wheels.

C is the brake-cylinder, suitably supported and supplied with air from a compressiontank. (Not shown in the drawings.)

D D are pistons housed within the brakecylinder and provided with piston-rods D D traveling in o posite directions. f

E E are brake-arms, preferably of the form shown, engaging the piston-rods D D at one end, their opposite ends formed with a cross member E the ends of which are arc-shaped, as shown at e.

F F are the forward brake-beams, spaced a suitable distance apart to admit the passage of the bolts G, secured in the brake-arms E. It will be noted by reference to Fig. 2 that the brake-arms are forked to permit them in the accompanying 'I to straddle the brake-beam F. The bolts G therefore are engaged in each of the tines of this forked portion. These bolts are preferably provided with antifriction-rolls sleeved on the bolts between the tines of the brakearms where they bear up'on'the brake-beams F and F. If desired, a speciallydiardened steel plate may be inserted in the beams at the point where the bolts G or rolls contact with the beams to lessen the wear on the latter.

H H H H are retaining-plates secured to the brake-beams F F,V provided with means for lateral adjustment, 'as indicated by the slotted way through which the bolts securing them to the brake-beams pass. The object of the retaining-plates is to insure against lateral displacement of the brake-arms.

I I are the brake-rods, engaged atl the for` ward end with the brake-beam F and at the rear of the car with the which are mounted the brake-shoes J, engaging the wheels. J represents the brake-shoes, secured to the brake-beam F, engaging the forward wheels of the car.

K represents the usual springs employed to pull the brake-shoes out of engagement with the wheels when the brakes are released.

L is a hand-brake lever fulcrumed at Z to the brake-beam F and engaging the bar l', secured to the brake-beam F. L is a cable or chain connecting the hand-brake lever L with a rotating brake-stan?. (Not shown.)

Having described the several parts, the operation of my apparatus will be understood. Air being admitted to the brake cylinder C, the pistons D are forced apart, the pistonrods of which being engaged to the brake* arms E serve to rock them, causing the bolts G, secured in the cross member of each brakearm, to bear against the brake-beams F and F, forcing them apart, thereby drawing the brake-shoes J and J in contact with the wheels. When the air is released from the cylinder, the brake-beams carrying their respective brake-shoes -are drawn out of contact with the wheels by the action of the springs K, the brake-arms E E again assuming the position shown in the drawings. A

It will'be readily understood that when the air-brake is out of commission and ower is applied to the hand brake lever same movement ofthe brake-beams F F just described will occur-namely, the forcing of the beams apart. This action, however, will be entirely independent of any brake-beam F2, on

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movement of the pistons D or the brakearms E E, which they operate, thereby relieving the operator of any unnecessary labor.

Having thus described my invention, what I claim isl. A braking mechanism comprising braking elements, a fluid-pressure cylinder operatively connecting said elements, the braking elements including a pair of adjacent beams, a bar secured to one of said beams, a lever Julcrumed upon the other of said beams, and pivotally connected to said bar whereby the raking elements may be operated'independently of and without resistance from the huid-pressure means.

2. A braking mechanism comprising braking elements, including oppositely-disposed arms, a fluid-pressure cylinder operatively connected to said arms to move the outer ends of the latter away from each other to a ply the brakes, and means for operating tile braking elements independently of the iiuidpressure means.

3. In a car-brake, brake-beams located adjacent to each other to which are engaged and connected the brake-shoes of the front and rear trucks, brake-arms provided with means for spreading the beams apart, an airbrake cylinder with pistons operating in opposite directions, thel piston-rods of each being connected with the ends of the respective brake-arms, substantially as described.

4. In a car-brake, brake-beams located adjacent to each other to which are engaged and connected the brake-shoes of the front and rear trucks, brake-arms provided with means for spreading the beams apart consisting of bolts projecting between the beams, said bolts provided with friction-rolls, suitable wearing-plates mounted in the beams against which the rolls contact, and means for operating said brake-arms, substantially as described.

f 5. In a car-brake, brake-beams located adjacent to each other to which are engaged the brake-shoes of the front and rear trucks, brake-arms provided with means for spreading the beams apart whereby the brake-shoes are forced in contact with .the wheels, retaining-plates, provided with means for lateral adjustment, secured to the brake-beams to insure the brake-arms against lateral displacement, substantially as described.

6. In a car-brake, brake-beams located adjacent to each other to which are engaged and connected the brake-shoes of the front and rear trucks, an air-brake cylinder having pistons working in opposite directions, the rods of which engage the ends of the brakearms, brake-arms provided with means for spreading the beams apart whereby, the brake-shoes are forced in contact with the wheels, said brake-arms slotted Jfor adjustment at the point where the piston-rods engage the arms, retaining-plates to engage the brake-arms to insure the brake-arms against lateral displacement, said retaining-plates provided with slotted ways through which the bolts pass which secure them to the brakebeams by means of which they may be adjusted laterally, substantially as described.

7. A braking mechanism comprising braking elements including o positely-disposed arms, a fluid-pressure cy inder operatively connecting said arms to move the outer ends of the latter away from eachother to ap ly the brakes, and means for applying the bra es independently of the fluid-pressure means.

8. A braking mechanism comprising braking elements including oppositely-disposed arms, a fluid pressure cylinder arranged transversely of the car between said arms and provided with pistons operating in opposite directions with respect to each other to move the arms and apply the brakes, and hand operating means for applying the brakes independently of the fluid-pressure means.

In testimony whereof I sign this specification in the presence of two witnesses.

DAVID J. HGUGHTON.

Witnesses:

S. E. THOMAS, HENRY E. VILLEROT. 

